ethinyl estradiol


: a very potent synthetic estrogen C20H24O2 used especially as an oral contraceptive

Examples of ethinyl estradiol in a Sentence

Recent Examples on the Web Taytulla, also called ethinyl estradiol, gained Food and Drug Administration approval in 2013. Austen Hufford, WSJ, 29 May 2018 Tyler’s experiments looked at one type of synthetic estrogen: ethinyl estradiol, or EE2, which is found in oral contraceptives like TriNessa and Seasonique. Becky Little, Smithsonian, 31 July 2017 One environmental estrogen is ethinyl estradiol—a chemical found in birth control pills. National Geographic, 3 Feb. 2016

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Word History

First Known Use

1938, in the meaning defined above

Time Traveler
The first known use of ethinyl estradiol was in 1938

Dictionary Entries Near ethinyl estradiol

Cite this Entry

“Ethinyl estradiol.” Dictionary, Merriam-Webster, Accessed 22 Apr. 2024.

Medical Definition

ethinyl estradiol

variants or ethynylestradiol or chiefly British ethinyloestradiol or ethynyloestradiol
: a white crystalline very potent synthetic estrogen C20H24O2 prepared from estrone and used in combination (as with norgestrel or norethindrone) as a birth control pill or alone in the treatment of menopausal symptoms or female hypogonadism or in the palliative treatment of prostate or breast cancer see loestrin, minastrin, nuvaring, ortho evra, ortho-novum, ortho tri-cyclen, seasonale, seasonique, yasmin, yaz
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